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Author
- Environmental Systems Research Institute (Redlands, Calif.)6
- Geological Survey (U.S.)6
- National Atlas of the United States4
- Canada Centre for Remote Sensing2
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)2
- United States. Bureau of Transportation Statistics2
- United States. Bureau of the Census. Geography Division2
- United States. Environmental Protection Agency2
- Rawson, Peg1